sbc rear intake manifold oil leaks

[Mike Savelle]

whats the best to seal the intake ? I've been using red silicone for years , but the last two engines have leaked badly , I Even redid it and it still leaked, is the red silicone no good ?

[JP1738]

Originally Posted by Mike Savelle

whats the best to seal the intake ? I've been using red silicone for years , but the last two engines have leaked badly , I Even redid it and it still leaked, is the red silicone no good ?

I was having this issue on my super gas sbc. I used black gasket maker (Permatex) and smeared it liberally across the back of the china wall after a thorough cleaning. Hasn't leaked since.

[JP1738]

Well at least it doesn't leak out of the back of the manifold anymore. The engine leaks like a sieve, just not from there lol.

[cad]

Ford TA-31 RTV silicone. Ive used it for years.

https://www.amazon.com/Genuine-Ford-TA-31-Silicone-Sealant

[Mark Ugrich]

G.M. 10-2006 engine sealant is good stuff also.

[Henrys Toy]

Originally Posted by Mark Ugrich

G.M. 10-2006 engine sealant is good stuff also.

Good morning to all,
I've been using the Permatex " Right Stuff " for a couple of years now.
The engine in my Suburban I recently went over the valve adjustment and found a couple of wet area's on the valve cover gaskets - I cleaned and used the Right Stuff on them and that oil leak is solved. No more oil smell while sitting in traffic. I use that on all my small block and big block china walls - zero leaks. It dries quick enough while dyno testing as well. I also use the Permatex Grey silicone with great success as long as you have time for it to properly cure. Make sure the surfaces are CLEAN and OIL FREE.
I found that to be very important in the curing process.
I hope that helps.

Respectfully,
Henry Kunz 1534 H/SA